Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e5cfc94c5b9d75…

MALICIOUS

PDF

65.2 KB Created: 2020-11-18 22:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c3e34e59f1859c876081c838690613 SHA-1: 500b89140bf3c2434e5941f7918f50d342d0c9fe SHA-256: b7e5cfc94c5b9d75d1a71678a20d1c5e4106694c89ad548490ec8190f5e3a7c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains heuristics indicating it is a phishing lure, specifically prompting the user to install a browser extension or update to view content. The embedded URL and document body text, though partially obfuscated, reference 'Krunker.io unblocked games', suggesting a social engineering tactic to trick users. The presence of external links and the ML classifier flagging it as malicious further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/123?utm_term=krunker.io+unblocked+games+6969
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/c5344a7a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ae919f37-93d1-42d3-96e5-84f5a55cf326/70784154710.pdf
    • https://s3.amazonaws.com/gupawupigawono/cops_n_robbers_mod_apk_2019.pdf
    • https://s3.amazonaws.com/zuxime/10000_reasons_bless_the_lord_chords.pdf
    • https://uploads.strikinglycdn.com/files/dee15c5a-65d7-45d7-87df-96efb3e7d3a9/kisowigujimatevujizazebuw.pdf
    • https://s3.amazonaws.com/wovigebi/tevibeno.pdf
    • https://uploads.strikinglycdn.com/files/2877a4a8-a4a7-4c4f-b402-8b8b82e2b78a/vudakugekejawe.pdf
    • https://uploads.strikinglycdn.com/files/8711ac91-b75d-480f-8a06-cc595e787c96/gajajodifik.pdf
    • https://uploads.strikinglycdn.com/files/9eed5c25-443a-4390-a4ae-071fcce4f6c3/70970342555.pdf
    • https://uploads.strikinglycdn.com/files/eeb141be-db02-4a33-a564-6b6823d611ab/the_humanities_culture_continuity_change.pdf
    • https://s3.amazonaws.com/luropi/30911533338.pdf
    • https://uploads.strikinglycdn.com/files/ae225790-49c9-4f32-b9cf-62ee57f308b7/morrowind_prophecies_game_of_the_yea.pdf
    • https://s3.amazonaws.com/didowugorokirug/difference_between_class_and_individual_evidence.pdf
    • https://uploads.strikinglycdn.com/files/a8fdfd45-c9c1-40a8-af7d-3864b09544bb/2938301949.pdf
    • https://uploads.strikinglycdn.com/files/84c316ca-60a5-4434-ac4b-9986189cf3da/telugu_torrenz_movies.com_free_download.pdf
    • https://uploads.strikinglycdn.com/files/bd4628b3-686e-4a1a-92b9-b6f35c6dd915/44267906528.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4da.bin
cf22254f1c97a06e2acf4f3cc95f554af4ebcd30d32fcd2368e5e23687f517b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 5576 bytes
font_01_sfnt_off0000c79f.bin
11768401caf7577b9b5557c71ed8bc477b07216a59063b12421f5b4007a32c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 9912 bytes
font_02_sfnt_off0000e98a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 4324 bytes

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